题目内容
17. is difficult for us to to work out the maths problem in five minutes.( )| A. | There | B. | It | C. | This | D. | That |
分析 对我们而言在五分钟之内做出这道数学题是困难的.
解答 答案:B
根据句意和联系后面的语境可知,考查固定句型:It is+形容词+for sb.+to do sth.对某人而言做某事…,其中it在句中放在句首作形式主语,to work out the maths problem在句中做真正的主语.
点评 此题考查it放于句首作形式主语的用法,在熟知用法的基础上,从而选出正确的答案.
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